Keeping to recover to nomal atatus after extemal forces aer remover .
After stretching, coil tubes can returm to its original status;
With advancer piping manufacture processing,pyysical properties such
As thickness, hardness and compression resistance retain stable.

Pull the knob of relief valve and rotate it, then the, then the compressed air pressure can be adjusted to the expired prdssure grade, and can make the pressure pulse balanced. Press down the dnob to lock it